2-6
IM 701310-01E
Relationship between the Specified Record Length, Time Axis Setting,
Sample Rate, and Display Record Length
If you change the time axis setting with respect to the specified record length of the
acquisition memory, the sample rate and display record length change. For more details
about this relationship, see Appendix 1.
Time Axis Setting and Roll Mode Display
If T/div is set to a certain range (see Appendix 1), instead of the displayed waveform
being updated by a trigger (update mode), the waveform is displayed in roll mode. In
roll mode, as new data is captured, the oldest values are deleted from the screen, as
the waveform scrolls from right to left. Thus roll mode display allows waveforms to be
observed in the same way as on a pen recorder. It is useful in observing low frequency
signals or signals that change slowly. It is also useful in detecting glitches (spikes in the
waveform) that occur intermittently.
* Roll mode display is also used when the trigger mode is set to single. However, the displayed
waveforms stop when a trigger is activated.
2.3 Vertical and Horizontal Axes
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